Across
- 1. a scientific method for determining the precise, numerical age of an object, fossil, or event in years
- 3. a period in Earth's history from approximately 252 to 66 million years ago
- 6. a unit of time equal to a thousand million years
- 7. the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers
- 10. the arrangement of events, facts, or items in the sequence that they occurred in time, from earliest to latest
Down
- 2. in an undisturbed sequence of rock layers (strata), the oldest layers at the bottom, and the youngest layers are at the top
- 4. a period of time in history or a person's life, typically one marked by notable events or particular characteristics
- 5. a method of determining the comparative age of rocks, fossils, or archaeological artifacts by establishing the sequence of events rather than providing a specific numerical age
- 8. a length or portion of time
- 9. a long and distinct period of history with a particular feature or characteristic